Hi A.! I wanted to respond, even though I am by no means an expert on this, I have read a little bit about POS, and my sister was told she has it. First, I would encourage you NOT to blame yourself. But at the same time, recognize that, like most other "syndromes" (doctors love to tell people they have a syndrome, and it sounds so horrible!), there are usually lifestyle changes that can be made, to either alleviate or end the symptoms. I applaud you for quitting smoking - that is NOT easy! My sister did the same thing and I am so proud of her. She also cut out soda and all artificial sweeteners, and started drinking organic milk, etc. (fewer hormones, etc).
It sounds funny, but if you have never read the South Beach Diet book, I recommend reading it - it is really interesting and talks about women with POS who have cut out refined carbohydrates and conceived shortly after. It's worth a try! Just look online to find out as much as you can about it and start making those little changes in diet and lifestyle - it can't hurt, because those are things we all should be doing anyway. I wish you the best, and keep us posted on what happens!
Love, M.